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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on an OC-N Circuit Path
Procedure: Test the Terminal Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information
that the test set is capable of indicating.
Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit:
a. Clear the terminal loopback:
• Double-click the OC-N card in the intermediate node with the terminal loopback.
• Click the Maintenance > Loopback tabs.
• Select None from the Loopback Type column for the port being tested.
• Select the appropriate state (IS, OOS, or OOS_AINS) in the State column for the port being
tested.
• Click the Apply button.
• Click the Yes button in the Confirmation Dialog box.
b. Clear the terminal loopback circuit:
• Click the Circuits tab.
• Choose the loopback circuit being tested.
• Click the Delete button.
• Click the Yes button in the Delete Circuits dialog box.
c. The entire OC-N circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
Step 4 If the test set indicates a faulty circuit, the problem might be a faulty card.
Step 5 Proceed to the “Test the OC-N Card” procedure on page 1-40.
Procedure: Test the OC-N Card
Step 1 Replace the suspect card with a card known to be good. See the “Physically Replace a Card” procedure
on page 2-130 for details.
Step 2 Resend test traffic on the loopback circuit with a good card.
Step 3 If the test set indicates a good circuit, the problem is probably the defective card:
a. Return the defective card to Cisco through the returned materials authorization (RMA) process.
Contact the Cisco TAC.
b. Replace the defective OC-N card. See the “Physically Replace a Card” procedure on page 2-130 for
details.
c. Clear the terminal loopback:
• Double-click the OC-N card in the source node with the terminal loopback.
• Click the Maintenance > Loopback tabs.
• Select None from the Loopback Type column for the port being tested.